Production logging (PLT) is used to diagnose a variety of production problems and for reservoir evaluation. A primary use of PLT is the identification of water entry into producing wells. If the water flow rate is low, the sensitivity of PLT does not allow adequate characterization. When this occurs, it is possible to use the recent water flow log (WFL) technique, which can locate and evaluate small water movement, both upflow and downflow, inside or outside the casing. This technique is based on the oxygen activation (OA) principle and incorporates the pulsed neutron capture (PNC) logs. One weakness of using the WFL technique is that quantification of flow rates may be difficult when water velocity tends to vary as a result of turbulence effects and changes in cross-sectional area. However, these difficulties can be overcome, and good results are possible in both open and cased hole by the combination of PLT and WFL techniques. To achieve good results, an optimal measurement program should be planned through the use of all available data : previous openhole and cased-hole logs, production data, well completion profile, etc. This paper describes the application of the PLT and OA techniques to some Italian wells in a variety of reservoir contexts. The interpretation of these logs together provided additional information helpful for planning remedial action for water shutoff.